Nyassi scored two goals in the match to earn Brikama United a 2-0 win over the Manjai Kunda based-club in their week-thirteen fixture played at the Independence Stadium in Bakau.
Brikama United now bagged 20 points after thirteen league outings and will vie to win their matches in the second round to keep league title aspirations.
Marimoo will scuffle to win their games in the second round to maintain their chances of staying in the country's top flight for another season.
Meanwhile, Wallidan drew 1-1 with Hawks at the Independence Stadium in Bakau to share the spoils.
